85 Buick Century Bucks Under Load

1985 BUICK CENTURY
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OAKLEY1
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  • 4 POSTS
I have an 85 Buick Century 150,000mi 2.5L TBI with an acceleration problem. Under low to modetare loads it bucks. Even with TCC unpluged. Plugs, wires, cap were replaced. Problem started soon after having ignition module replaced. While power braking and looking at the fuel injector you can see the fuel momentarily stop spraying when it bucks. Where does injector get its reference from? Could it be the ignition module, MAF sensor, does it have one and if so where is it located? Thank you for and advice.
Apr 19, 2007 at 10:21 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check the fuel pressure-this will give you an idea what the pressure regulator and fuel pump are doing.
Apr 20, 2007 at 3:08 AM
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OAKLEY1
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  • 4 POSTS
Fuel Pressure is normal
Apr 20, 2007 at 3:23 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
This problem can be a bear to find Check the O2,TPS,MAP sensors and ignition timing,vacuum leak,dirty injectors and bad gas.
Apr 20, 2007 at 4:22 PM
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